When a new patient appears in a New York psychiatric hospital, no one doubts that he belongs there, because he claims that he came from a distant planet where complete harmony reigns. However, this is his only oddity - otherwise he is a sane, intelligent and pleasant person who changes the lives of everyone around him for the better. The incredible story of Prot - a patient in a psychiatric hospital who calls himself an alien from the distant planet KA-PEX - and a talented psychiatrist who is trying to cure a mysterious madman. How thin is the line that separates fantasy from madness, and madness from miracles?